Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['4869', 'B', 'k', 'k', '7667', '1725', 'b', 'p', '8649']

4869, 2, 11, 11, 7667, 1725, 2, 16, 8649